Saute sausage in heavy large skillet over medium-high heat until cooked through, crumbling sausage with back of spoon, about 10 minutes.,______,Add butter, onions and celery to skillet; saute until onions are tender, about 15 minutes.,Add apples; saute until apples are tender but still hold shape, about 10 minutes.,Add sage, thyme and allspice; saute 1 minute.,Add to sausage.,Stir in stuffing mix.,Season with salt and pepper.,(Can be made 1 day ahead.,Cover; chill.),Preheat oven to 325F.,Generously butter 5x10-inch glass baking dish.,Fill center of crown roast of pork with stuffing.,Transfer remaining stuffing to prepared dish.,Cover with foil and bake until heated through, about 40 minutes.